Battery pack

Abstract

An outer case (10, 20, 35, 40) for housing a rechargeable battery (1, 31, 41) and a battery circuit therein is composed of an upper case (7, 21, 42) and a lower case (8, 22, 43), each being formed as a half-shell body. The respective bottom faces of the upper case (7, 21, 42) and the lower case (8, 22, 43) are formed of film members (7b, 8b, 32, 34, 42b, 43b), and are integrally formed with resin moldings (7a, 8a, 33, 42c, 43c) forming circumferential side faces.

Description

TECHNICAL FIELD [0001] The present invention relates to a battery pack which is reduced in size, weight, and thickness so as to be used as a battery power source for portable electronic equipment that is increasingly reduced in size as well as in thickness. BACKGROUND ART [0002] There is an increasing demand for reduction in size, weight, and thickness of portable information equipment and portable audio equipment such as a portable telephone and a mobile computer so as to improve their portability. It would not be an exaggeration to state that a battery power source is the key to realize such a reduction. In particular, there is a strong demand for reduction in weight and thickness of a battery power source device using a rechargeable battery. [0003] As a rechargeable battery constituting a battery power source device of portable equipment, a nickel-cadmium battery, a nickel metal hydride battery, and a lithium ion rechargeable battery are used. Above all, the lithium ion rechargea...

AI Technical Summary

Benefits of technology

[0011] Moreover, although the mass-productivity is degraded due to poor moldability of a part having a small thickness in a conventional method using an outer case obtained by resin molding, the mass-productivity is improved by using the film member. Furthermore, although the principal faces are required to satisfy both the moldability of a material and the mechanical strength for the conventional outer case obtained by resin molding, the use of film members allows the selection of a material with a high regard for the mechanical strength.

[0022] Furthermore, the battery circuit is configured with the circuit board. The circuit board is provided for the outer case, so that the circuit board is fixed to the outer case. As a result, the circuit board is held surely. Therefore, it becomes easy to form the external connection terminal on the circuit board and to externally expose the external connection terminal through an opening formed through the side circumferential surface of the outer case.

Problems solved by technology

Moreover, although the mass-productivity is degraded due to poor moldability of a part having a small thickness in a conventional method using an outer case obtained by resin molding, the mass-productivity is improved by using the film member.

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